Thin films of carbon nanotubes and chemically reduced graphenes for electrochemical micro-capacitors

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• 作者：Hye Ryung Byon ; Seung Woo Lee ; Shuo Chen ; Paula T. Hammond ; Yang Shao-Horn
• 刊名：Carbon
• 出版年：2011
• 出版时间：February 2011
• 年：2011
• 卷：49
• 期：2
• 页码：457-467
• 全文大小：1896 K

文摘

We report the making of chemically reduced graphene (CRG) sheets separated by layer-by-layer-assembled multi-walled carbon nanotubes (MWCNTs) for electrochemical micro-capacitor applications. Submicron thin films of amine-functionalized MWCNTs (MWCNT-NH₂) and CRG derived from graphene oxides, were shown to be cross-linked with amide bonds having high packing densities of 70 % . These carbon-only electrodes were found to have large volumetric capacitance of in an acidic electrolyte (0.5 M H₂SO₄). The electrode capacitance in a neutral electrolyte (1 M KCl) was found much lower, which supported the hypothesis that the observed high capacitances in the acidic electrolyte can be attributed primarily to redox reactions between protons and surface oxygen-containing groups on carbon.